A rare 'black moon' will rise this Friday night, turning the sky dark as the Western Hemisphere experiences its second new moon of the month.

Those on the other side of the world will have to wait until next month for the same event to occur, but it’ll be worth it - their eerie black moon is set to coincide with Halloween.

If you’re having trouble keeping up with all the different types of 'moons' we've got now - with blood moons, blue moons, and supermoons clogging up your sky-watching calendar - the black moon is a fairly new addition, and experts are still trying to nail down its definition.